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<table width="100%" summary="page for volcano"><tr><td>volcano</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Topographic Information on Auckland's Maunga Whau Volcano</h2>

<h3>Description</h3>

<p>Maunga Whau (Mt Eden) is one of about 50 volcanos in the Auckland
volcanic field.  This data set gives topographic information for
Maunga Whau on a 10m by 10m grid.
</p>


<h3>Usage</h3>

<pre>volcano</pre>


<h3>Format</h3>

<p>A matrix with 87 rows and 61 columns, rows corresponding to grid lines
running east to west and columns to grid lines running south to
north.</p>


<h3>Source</h3>

<p>Digitized from a topographic map by Ross Ihaka.
These data should not be regarded as accurate.
</p>


<h3>See Also</h3>

<p><code>filled.contour</code> for a nice plot.</p>


<h3>Examples</h3>

<pre>
require(grDevices); require(graphics)
filled.contour(volcano, color.palette = terrain.colors, asp = 1)
title(main = "volcano data: filled contour map")
</pre>


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